This article presents a global overview of the state of communications media ownership and markets. The primary issue at stake is whether or not markets and ownership are becoming more or less concentrated. After reviewing contrasting views on this issue, I suggest that the question turns on whether or not we consider 'numerical diversity' (the number of channels available in any given area) versus 'source diversity' (a measure of the number of media owners in any given area). Drawing on recent data I suggest that while there is undoubtably greater 'numerical diversity', we are seeing -within countries, regionally and globallygreater concentration at the level of 'source diversity'. While new media, especially the Internet, open up unprecedented opportunities for people to access and distribute information, the emergence of a powerful nexus between both 'old' and 'new' media means that the character of media ownership and markets still matters greatly. This nexus of ownership and market power spans different segments of the media and is qualitatively different from previous times. These factors have an important influence on the evolution of media technologies and markets, the work of media professionals and the character of information and media content.A new journal needs to start out on a high note, addressing important issues in a timely and accessible way. Questions about media ownership and the state of media markets, within nations and worldwide, fit that bill. They are perennial issues, as well. In the past few years, and even as I write, Australia, Britain, Canada, Mexico and the USA, among many others, have relaxed their media ownership rules. Do, or will, these changes foster healthier competition, as advocates claim, or even more consolidation, as critics charge? What effect will they have on media content, media professionals, the evolution of media technologies and the role of communications media in society, democratic or otherwise? These questions are the core themes of this article.Several factors have propelled structural changes in communication and media markets, within countries and globally. These factors include the